FEN (Forsyth-Edwards Notation)
A compact text code that describes an entire board position.
FEN encodes a full position — piece placement, whose turn it is, castling rights, en passant target, and move counters — in one line of text, e.g. rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 for the starting position. Try the FEN editor.
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